diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7d3808..6cd9c7c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+  * Parallelize per-locale merging in `mix gettext.merge`.
+
 ## v1.0.2
 
   * Only skip manifest removal on Elixir v1.19.3+
diff --git a/lib/mix/tasks/gettext.merge.ex b/lib/mix/tasks/gettext.merge.ex
index 49efebc..3371bba 100644
--- a/lib/mix/tasks/gettext.merge.ex
+++ b/lib/mix/tasks/gettext.merge.ex
@@ -191,9 +191,17 @@ defmodule Mix.Tasks.Gettext.Merge do
   end
 
   defp merge_all_locale_dirs(pot_dir, opts, gettext_config) do
-    for locale <- File.ls!(pot_dir), File.dir?(Path.join(pot_dir, locale)) do
-      merge_dirs(locale_dir(pot_dir, locale), pot_dir, locale, opts, gettext_config)
-    end
+    pot_dir
+    |> File.ls!()
+    |> Enum.filter(&File.dir?(Path.join(pot_dir, &1)))
+    |> Task.async_stream(
+      fn locale ->
+        merge_dirs(locale_dir(pot_dir, locale), pot_dir, locale, opts, gettext_config)
+      end,
+      ordered: false,
+      timeout: :infinity
+    )
+    |> Stream.run()
   end
 
   def locale_dir(pot_dir, locale) do